211434221 has 2 divisors, whose sum is σ = 211434222. Its totient is φ = 211434220.

The previous prime is 211434203. The next prime is 211434227. The reversal of 211434221 is 122434112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156600196 + 54834025 = 12514^2 + 7405^2 .

It is a cyclic number.

It is not a de Polignac number, because 211434221 - 2¹⁴ = 211417837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211434193 and 211434202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211434227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105717110 + 105717111.

It is an arithmetic number, because the mean of its divisors is an integer number (105717111).

Almost surely, 2^211434221 is an apocalyptic number.

It is an amenable number.

211434221 is a deficient number, since it is larger than the sum of its proper divisors (1).

211434221 is an equidigital number, since it uses as much as digits as its factorization.

211434221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 20.

The square root of 211434221 is about 14540.7778677759. Note that the first 3 decimals coincide. The cubic root of 211434221 is about 595.7422847537.

Adding to 211434221 its reverse (122434112), we get a palindrome (333868333).

The spelling of 211434221 in words is "two hundred eleven million, four hundred thirty-four thousand, two hundred twenty-one".